I think you guys are just bad at the game...
With a day with no school,
I got Dejavu in 2 hours with minimal obstacles,
Endure in 2 hours (1:59:41 to be exact) with no problems, and a creepy score of 66,666
And classic on uplift reserve in 10 minutes, the only hard part is the start, after you pass the wraiths you get the ghost and it all plays out.
All I need is annual, which I never finished on halo 3.
Anyone wanna do it? My Gamertag is Sketch 447 and I know the easiest way to complete it.